Commit a4379fd8 authored Jan 12, 2015 by Michael S. Tsirkin Committed by Rusty Russell Jan 21, 2015

virtio/blk: verify device has config space



Some devices might not implement config space access
(e.g. remoteproc used not to - before 3.9).
virtio/blk needs config space access so make it
fail gracefully if not there.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

parent 7754f53e

drivers/block/virtio_blk.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -575,6 +575,12 @@ static int virtblk_probe(struct virtio_device *vdev)
		u16 min_io_size;
		u8 physical_block_exp, alignment_offset;

		if (!vdev->config->get) {
		dev_err(&vdev->dev, "%s failure: config access disabled\n",
		__func__);
		return -EINVAL;
		}

		err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS),
		GFP_KERNEL);
		if (err < 0)